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30+ dev utilities that run 100% client-side. Your code never touches a server.
37 free tools - no signup required
Our most-used developer tools - start here
Format, validate, and beautify JSON data with syntax highlighting.
Use free🔣Encode and decode text or files to and from Base64 format.
Use free🔎Test and debug regular expressions with real-time matching and explanation.
Use free🔓Decode, inspect, and verify JSON Web Tokens (JWT) instantly.
Use freePick from 37 free developer tools below.
Enter your data or upload your file. Everything processes in your browser.
Copy, download, or share your results. No signup needed.
Format, validate, and beautify JSON data with syntax highlighting.
Format and beautify SQL queries with syntax highlighting and indentation.
Format, beautify, and indent HTML code for better readability.
Minify CSS code to reduce file size and improve page load speed.
Minify JavaScript code to reduce file size. Remove whitespace, comments, and shorten code.
Write and preview Markdown with live rendering and export to HTML.
Convert between YAML and JSON formats instantly.
Encode and decode text or files to and from Base64 format.
Encode and decode URLs, query strings, and URI components.
Encode and decode HTML entities, special characters, and symbols.
Decode, inspect, and verify JSON Web Tokens (JWT) instantly.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.
Convert numbers between binary, octal, decimal, and hexadecimal.
Generate random UUIDs (v4) and other versions in bulk instantly.
Generate strong, secure passwords with customizable length and character sets.
Generate placeholder text in paragraphs, sentences, or words.
Create beautiful CSS gradients with a visual editor and copy the code.
Generate harmonious color palettes from a base color or image.
Generate realistic fake names, emails, addresses, phone numbers, and companies for testing. Export as JSON or CSV.
Test and debug regular expressions with real-time matching and explanation.
Build and validate cron expressions with a visual schedule builder.
Test cron expressions with human-readable descriptions and next 10 run times.
Compare two blocks of text and highlight the differences line by line.
Check WCAG color contrast ratios for accessibility compliance.
Pick colors and convert between HEX, RGB, HSL, and other formats.
Browse and search all HTTP status codes with descriptions and usage examples.
Parse and analyze user agent strings to detect browser, OS, and device.
Look up your current IP address, approximate location, ISP, and timezone.
Calculate Unix file permissions in numeric and symbolic notation.
Convert JSON arrays to CSV format for spreadsheets and data analysis.
Convert JSON objects to TypeScript interfaces and type definitions.
Convert between Unix timestamps, ISO 8601, and human-readable dates.
Convert between Unix timestamps and human-readable dates. Shows relative time.
Open, edit, sort, filter, and download CSV files in your browser. Export as CSV, TSV, or JSON.
Count words, characters, sentences, paragraphs, and reading time.
Add gradient backgrounds, shadows, rounded corners, and browser chrome to your screenshots.
Generate favicons in all standard sizes from any image. Get the HTML code snippet for your site.
Convert hex color codes to RGB, HSL, and more. Live preview with one-click copy for all formats.
Learn how to get the most out of these tools
A comprehensive regex cheat sheet with syntax, examples, and common patterns. Copy-paste ready regular expressions for email, URL, phone, and more.
Read guideA developer's guide to Base64 encoding. Learn the algorithm, see real examples, understand when to use it (and when not to), and avoid common mistakes.
Read guideConvert cURL commands to Python, JavaScript, Go, PHP, and more. Copy-paste ready code snippets.
Read guideEverything about hex color codes. How they work, common colors, and converting between hex, RGB, and HSL.
Read guideYes. All developer tools process data entirely in your browser using JavaScript. Nothing is sent to any server. This makes them safe for API keys, tokens, and production data.
Most developer tools work offline once the page is loaded, since they run entirely in your browser. Bookmark your most-used tools for quick access.
Yes. The JSON formatter handles files up to several megabytes. For extremely large files, processing time depends on your device speed since everything runs locally.
The regex tester uses JavaScript regular expressions, which are compatible with most web and backend languages. Flags like global, case-insensitive, and multiline are supported.
Paste your JWT token into the JWT decoder. It instantly shows the header, payload, and signature. No server-side processing - safe for production tokens.
The hash generator supports MD5, SHA-1, SHA-256, and SHA-512. All hashing runs locally using the Web Crypto API.
Essential developer tools for formatting, encoding, decoding, generating, and validating data. JSON formatter, Base64 encoder, UUID generator, regex tester, hash generator, and more - all running in your browser with zero latency.